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NITINOL MATERIAL PROPERTIES OF 11 COMMERCIAL PERIPHERAL STENTS DETERMINED USING INVERSE COMPUTATIONAL ANALYSIS
Eric Anttila1, Kaspars Maleckis2, Majid Jadidi2
1Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA.
Biorxiv : the Preprint Server for Biology
|December 12, 2025
Summary
Mechanical properties of Nitinol stents for peripheral arterial disease (PAD) vary significantly between devices. This data can improve computational models and device design for better endovascular repair outcomes.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Medical Device Technology
Background:
- Self-expanding Nitinol stents are crucial for treating peripheral arterial disease (PAD).
- Understanding stent-artery interactions requires detailed knowledge of Nitinol mechanical properties, which is currently limited.
- Variability in Nitinol properties across different stent models may affect device performance and clinical outcomes.
Purpose of the Study:
- To comprehensively characterize the mechanical properties of eleven commonly used Nitinol stents for PAD.
- To compare experimental data with finite element simulations for improved model accuracy.
- To provide essential material data for enhancing computational models of stent-artery interactions.
Main Methods:
- Eleven Nitinol stents (Absolute Pro, S.M.A.R.T. Control, Misago, Zilver, Complete SE, EverFlex, Innova, Pulsar-18, LifeStent, S.M.A.R.T. Flex, Supera) underwent axial tension, compression, three-point bending, and torsion testing.
- Inverse computational analysis determined key material properties: austenite/martensite elasticity, transformation stretch, and transformation stresses.
- Uniaxial tensile tests on isolated stent struts validated inverse analysis results.
Main Results:
- Significant variations in Nitinol mechanical properties were observed across the tested stent devices.
- Austenite elasticity ranged from 7.5-85 GPa, martensite elasticity from 10-47.8 GPa.
- Transformation stretch varied between 1.03-1.08, with transformation stresses showing notable ranges (e.g., 386-465 MPa for start of loading).
- S.M.A.R.T. Control and S.M.A.R.T. Flex exhibited the softest response, while Pulsar-18 demonstrated the hardest.
Conclusions:
- Nitinol material properties differ substantially among PAD stent devices.
- The characterized properties enhance the accuracy of computational models for stent-artery interactions.
- This data can inform better stent design, potentially improving clinical outcomes in endovascular PAD repair.
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